Bismuth subgallate is an astringent and anticorrosive drug, and is used for skin diseases such as eczema.

Bismuth acid and bismuth nitrate are used as salt. In stainless steel tank in gallnut and right amount water, heated to 90 ℃ dissolve, filter available gallic acid aqueous solution. Add a little hot water to bismuth nitrate and stir until no bismuth nitrate is prepared, then add in a solution of gallic acid solution, and then continue stirring for 0.5h. After precipitation, filtration, cake at 50 ℃ water washing, no acidity after filtering, drying under 70 ℃, time of gallic acid bismuth.

Qingdao Sigma Chemical Co.,Ltd is a global chemical industry manufacturers and suppliers of pharmaceuticals 

and intermediates, food and feed additives, herbal extracts, agrochemicals and fine chemicals etc.

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